Danfoss VLT AutomationDrive FC 301 Programming Manual page 74

Parameter Descriptions
4-30 Motor Feedback Loss Function
Option:
[6] Switch to Open
Loop
[7] Select Setup 1
3 3
[8] Select Setup 2
[9] Select Setup 3
[10] Select Setup 4
[11] stop & trip
Warning 90 is active as soon as the value in 4-31 Motor
Feedback Speed Error is exceeded, regardless of the setting
of 4-32 Motor Feedback Loss Timeout. Warning/Alarm 61
Feedback Error is related to the Motor Feedback Loss
Function.
4-31 Motor Feedback Speed Error
Range:
300 RPM [1 - 600 RPM] Select the max allowed error in speed
*
Speed
[rpm]
Illustration 3.31 Motor Feedback Speed Error
4-32 Motor Feedback Loss Timeout
Range:
0.05 s [0 - 60
*
s]
4-34 Tracking Error Function
Option:
72
VLT
Function:
Function:
(output speed vs. feedback).
n
calc
n
actual
P 4-31
P 4-32
Function:
Set the timeout value allowing the speed error
set in 4-31 Motor Feedback Speed Error to be
exceeded before enabling the function
selected in 4-30 Motor Feedback Loss Function.
Function:
This function is used to monitor that the
application follows the expected speed profile. In
Closed loop the speed reference to the PID is
compared to the encoder feedback (filtered) In
open loop the speed reference to the PID is
compensated for slip and compared to the
®
AutomationDrive FC 301/302 Programming Guide
4-34 Tracking Error Function
Option:
[0] Disable
[1] Warning
[2] Trip
[3] Trip after
stop
Warning/Alarm 78 Tracking Error is related to the Tracking
Error Function.
4-35 Tracking Error
Range:
10 RPM [1 - 600
*
RPM]
4-36 Tracking Error Timeout
Range:
1 s [0 - 60 s] Enter the time-out period during which an error
*
Time
[sec]
4-37 Tracking Error Ramping
Range:
100 RPM
*
RPM]
4-38 Tracking Error Ramping Timeout
Range:
1 s [0 - 60 s] Enter the time-out period during which an error
*
MG33MH02 - Rev. 2013-09-30
Function:
frequency that is sent to the motor
(16-13 Frequency).
The reaction is activated, if the measured
difference is more than specified in 4-35 Tracking
Error for the time specified in 4-36 Tracking Error
Timeout.
A tracking error in closed loop does not imply
that there is a problem with the feedback signal!
A tracking error can be the result of torque limit
at too big loads.
Function:
Enter the maximum permissible speed error
between the motor speed and the output of
the ramp when not ramping. In open loop
the motor speed is estimated and in closed
loop it is the feedback from encoder/
resolver.
Function:
greater than the value set in 4-35 Tracking Error
is permissible.
Function:
[1 - 600 Enter the maximum permissible speed error
between the motor speed and the output
of the ramp when ramping. In open loop
the motor speed is estimated and in closed
loop it is the feedback from encoder/
resolver.
Function:
greater than the value set in 4-37 Tracking Error
Ramping while Ramping is permissible.